In VW, the protocols are consistent and iterating over a collection never iterates over the elements one is adding while iterating over it. Therefore, I believe most frameworks should expect this behavior (at least the ones cross smalltalk) which sounds the most correct.

I think we should fix the world menu implementation and make the protocols consistent. Alternatively, we can let VW be a much more consistent Smalltalk environment than Pharo. What do you think ?

Wrong wrong wrong..

you either iterate over collection, or modify it.. not both.